1515151697 has 4 divisors (see below), whose sum is σ = 1517508720. Its totient is φ = 1512794676.

The previous prime is 1515151669. The next prime is 1515151699. The reversal of 1515151697 is 7961515151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7961515151 = 53 ⋅150217267.

It is a cyclic number.

It is not a de Polignac number, because 1515151697 - 2⁸ = 1515151441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1515151699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177547 + ... + 1178832.

It is an arithmetic number, because the mean of its divisors is an integer number (379377180).

Almost surely, 2^1515151697 is an apocalyptic number.

It is an amenable number.

1515151697 is a deficient number, since it is larger than the sum of its proper divisors (2357023).

1515151697 is an equidigital number, since it uses as much as digits as its factorization.

1515151697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357022.

The product of its digits is 47250, while the sum is 41.

The square root of 1515151697 is about 38924.9495439622. The cubic root of 1515151697 is about 1148.5556402544. Note that the first 3 decimals are identical.

The spelling of 1515151697 in words is "one billion, five hundred fifteen million, one hundred fifty-one thousand, six hundred ninety-seven".