151490981 has 2 divisors, whose sum is σ = 151490982. Its totient is φ = 151490980.

The previous prime is 151490951. The next prime is 151491001. The reversal of 151490981 is 189094151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102616900 + 48874081 = 10130^2 + 6991^2 .

It is an emirp because it is prime and its reverse (189094151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 151490981 - 2¹⁴ = 151474597 is a prime.

It is a super-2 number, since 2×151490981² = 45899034648684722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151490951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75745490 + 75745491.

It is an arithmetic number, because the mean of its divisors is an integer number (75745491).

Almost surely, 2^151490981 is an apocalyptic number.

It is an amenable number.

151490981 is a deficient number, since it is larger than the sum of its proper divisors (1).

151490981 is an equidigital number, since it uses as much as digits as its factorization.

151490981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 151490981 is about 12308.1672478074. The cubic root of 151490981 is about 533.0839323065.

The spelling of 151490981 in words is "one hundred fifty-one million, four hundred ninety thousand, nine hundred eighty-one".