1561231450 has 48 divisors (see below), whose sum is σ = 2975434560. Its totient is φ = 609269120.

The previous prime is 1561231433. The next prime is 1561231489. The reversal of 1561231450 is 541321651.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 402219 + ... + 406081.

It is an arithmetic number, because the mean of its divisors is an integer number (61988220).

Almost surely, 2^1561231450 is an apocalyptic number.

1561231450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561231450 is a deficient number, since it is larger than the sum of its proper divisors (1414203110).

1561231450 is a wasteful number, since it uses less digits than its factorization.

1561231450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4071 (or 4066 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1561231450 is about 39512.4214646483. The cubic root of 1561231450 is about 1160.0830920463.

The spelling of 1561231450 in words is "one billion, five hundred sixty-one million, two hundred thirty-one thousand, four hundred fifty".