2572129691 has 4 divisors (see below), whose sum is σ = 2572598112. Its totient is φ = 2571661272.

The previous prime is 2572129687. The next prime is 2572129727. The reversal of 2572129691 is 1969212752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2572129691 - 2² = 2572129687 is a prime.

It is a super-2 number, since 2×2572129691² = 13231702294647510962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2572122691) 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, 225875 + ... + 236988.

It is an arithmetic number, because the mean of its divisors is an integer number (643149528).

Almost surely, 2^2572129691 is an apocalyptic number.

2572129691 is a deficient number, since it is larger than the sum of its proper divisors (468421).

2572129691 is an equidigital number, since it uses as much as digits as its factorization.

2572129691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468420.

The product of its digits is 136080, while the sum is 44.

The square root of 2572129691 is about 50716.1679447491. The cubic root of 2572129691 is about 1370.1379247362.

The spelling of 2572129691 in words is "two billion, five hundred seventy-two million, one hundred twenty-nine thousand, six hundred ninety-one".