1523721542 has 12 divisors (see below), whose sum is σ = 2658738780. Its totient is φ = 653023476.

The previous prime is 1523721541. The next prime is 1523721583. The reversal of 1523721542 is 2451273251.

It is a junction number, because it is equal to n+sod(n) for n = 1523721499 and 1523721508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1523721541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7773992 + ... + 7774187.

It is an arithmetic number, because the mean of its divisors is an integer number (221561565).

Almost surely, 2^1523721542 is an apocalyptic number.

1523721542 is a deficient number, since it is larger than the sum of its proper divisors (1135017238).

1523721542 is a wasteful number, since it uses less digits than its factorization.

1523721542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15548195 (or 15548188 counting only the distinct ones).

The product of its digits is 16800, while the sum is 32.

The square root of 1523721542 is about 39034.8759700860. The cubic root of 1523721542 is about 1150.7170177534.

Adding to 1523721542 its reverse (2451273251), we get a palindrome (3974994793).

The spelling of 1523721542 in words is "one billion, five hundred twenty-three million, seven hundred twenty-one thousand, five hundred forty-two".