1531140542 has 4 divisors (see below), whose sum is σ = 2296710816. Its totient is φ = 765570270.

The previous prime is 1531140509. The next prime is 1531140557. The reversal of 1531140542 is 2450411351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2450411351 = 541 ⋅4529411.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382785134 + ... + 382785137.

It is an arithmetic number, because the mean of its divisors is an integer number (574177704).

Almost surely, 2^1531140542 is an apocalyptic number.

1531140542 is a deficient number, since it is larger than the sum of its proper divisors (765570274).

1531140542 is an equidigital number, since it uses as much as digits as its factorization.

1531140542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765570273.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1531140542 is about 39129.7909782304. The cubic root of 1531140542 is about 1152.5816084616.

Adding to 1531140542 its reverse (2450411351), we get a palindrome (3981551893).

The spelling of 1531140542 in words is "one billion, five hundred thirty-one million, one hundred forty thousand, five hundred forty-two".