1031681261 has 16 divisors (see below), whose sum is σ = 1227550464. Its totient is φ = 857328384.

The previous prime is 1031681251. The next prime is 1031681281. The reversal of 1031681261 is 1621861301.

It is a cyclic number.

It is not a de Polignac number, because 1031681261 - 2⁶ = 1031681197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031681201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96401 + ... + 106566.

It is an arithmetic number, because the mean of its divisors is an integer number (76721904).

Almost surely, 2^1031681261 is an apocalyptic number.

It is an amenable number.

1031681261 is a deficient number, since it is larger than the sum of its proper divisors (195869203).

1031681261 is a wasteful number, since it uses less digits than its factorization.

1031681261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203020.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1031681261 is about 32119.7954694609. The cubic root of 1031681261 is about 1010.4508202119.

The spelling of 1031681261 in words is "one billion, thirty-one million, six hundred eighty-one thousand, two hundred sixty-one".