1535121690 has 16 divisors (see below), whose sum is σ = 3684292128. Its totient is φ = 409365776.

The previous prime is 1535121689. The next prime is 1535121697. The reversal of 1535121690 is 961215351.

It is a super-2 number, since 2×1535121690² = 4713197206216912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1535121697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25585332 + ... + 25585391.

It is an arithmetic number, because the mean of its divisors is an integer number (230268258).

Almost surely, 2^1535121690 is an apocalyptic number.

1535121690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1535121690 is an abundant number, since it is smaller than the sum of its proper divisors (2149170438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1535121690 is a wasteful number, since it uses less digits than its factorization.

1535121690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51170733.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 1535121690 is about 39180.6290148589. The cubic root of 1535121690 is about 1153.5796937902.

The spelling of 1535121690 in words is "one billion, five hundred thirty-five million, one hundred twenty-one thousand, six hundred ninety".