131861437465 has 32 divisors (see below), whose sum is σ = 170644320000. Its totient is φ = 97461331968.

The previous prime is 131861437459. The next prime is 131861437619. The reversal of 131861437465 is 564734168131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131861437465 - 2⁹ = 131861436953 is a prime.

It is a super-2 number, since 2×131861437465² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 988836 + ... + 1114234.

It is an arithmetic number, because the mean of its divisors is an integer number (5332635000).

Almost surely, 2^131861437465 is an apocalyptic number.

It is an amenable number.

131861437465 is a deficient number, since it is larger than the sum of its proper divisors (38782882535).

131861437465 is a wasteful number, since it uses less digits than its factorization.

131861437465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125649.

The product of its digits is 1451520, while the sum is 49.

The spelling of 131861437465 in words is "one hundred thirty-one billion, eight hundred sixty-one million, four hundred thirty-seven thousand, four hundred sixty-five".