37223561 has 2 divisors, whose sum is σ = 37223562. Its totient is φ = 37223560.

The previous prime is 37223539. The next prime is 37223579. The reversal of 37223561 is 16532273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27237961 + 9985600 = 5219^2 + 3160^2 .

It is an emirp because it is prime and its reverse (16532273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37223561 - 2²² = 33029257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (37223521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18611780 + 18611781.

It is an arithmetic number, because the mean of its divisors is an integer number (18611781).

Almost surely, 2^37223561 is an apocalyptic number.

37223561 is the 2729-th centered decagonal number.

It is an amenable number.

37223561 is a deficient number, since it is larger than the sum of its proper divisors (1).

37223561 is an equidigital number, since it uses as much as digits as its factorization.

37223561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 29.

The square root of 37223561 is about 6101.1114561201. Note that the first 3 decimals coincide. The cubic root of 37223561 is about 333.8919684795.

The spelling of 37223561 in words is "thirty-seven million, two hundred twenty-three thousand, five hundred sixty-one".