951617981 has 2 divisors, whose sum is σ = 951617982. Its totient is φ = 951617980.

The previous prime is 951617941. The next prime is 951618001. The reversal of 951617981 is 189716159.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 948948025 + 2669956 = 30805^2 + 1634^2 .

It is a cyclic number.

It is not a de Polignac number, because 951617981 - 2¹⁴ = 951601597 is a prime.

It is a super-2 number, since 2×951617981² = 1811153563525032722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (951617941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 475808990 + 475808991.

It is an arithmetic number, because the mean of its divisors is an integer number (475808991).

Almost surely, 2^951617981 is an apocalyptic number.

It is an amenable number.

951617981 is a deficient number, since it is larger than the sum of its proper divisors (1).

951617981 is an equidigital number, since it uses as much as digits as its factorization.

951617981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 47.

The square root of 951617981 is about 30848.3059664546. The cubic root of 951617981 is about 983.6053444814.

The spelling of 951617981 in words is "nine hundred fifty-one million, six hundred seventeen thousand, nine hundred eighty-one".