1931629507261 has 4 divisors (see below), whose sum is σ = 2045254772412. Its totient is φ = 1818004242112.

The previous prime is 1931629507229. The next prime is 1931629507273. The reversal of 1931629507261 is 1627059261391.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1293019152100 + 638610355161 = 1137110^2 + 799131^2 .

It is a cyclic number.

It is not a de Polignac number, because 1931629507261 - 2⁵ = 1931629507229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1931629507199 and 1931629507208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931629507211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56812632550 + ... + 56812632583.

It is an arithmetic number, because the mean of its divisors is an integer number (511313693103).

Almost surely, 2^{1931629507261} is an apocalyptic number.

It is an amenable number.

1931629507261 is a deficient number, since it is larger than the sum of its proper divisors (113625265151).

1931629507261 is a wasteful number, since it uses less digits than its factorization.

1931629507261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113625265150.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 1931629507261 in words is "one trillion, nine hundred thirty-one billion, six hundred twenty-nine million, five hundred seven thousand, two hundred sixty-one".