151240781 has 2 divisors, whose sum is σ = 151240782. Its totient is φ = 151240780.

The previous prime is 151240753. The next prime is 151240799. The reversal of 151240781 is 187042151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119137225 + 32103556 = 10915^2 + 5666^2 .

It is an emirp because it is prime and its reverse (187042151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 151240781 - 2⁶ = 151240717 is a prime.

It is a super-2 number, since 2×151240781² = 45747547674979922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151240081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75620390 + 75620391.

It is an arithmetic number, because the mean of its divisors is an integer number (75620391).

Almost surely, 2^151240781 is an apocalyptic number.

It is an amenable number.

151240781 is a deficient number, since it is larger than the sum of its proper divisors (1).

151240781 is an equidigital number, since it uses as much as digits as its factorization.

151240781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 151240781 is about 12297.9990648886. Note that the first 3 decimals coincide. The cubic root of 151240781 is about 532.7902930537.

The spelling of 151240781 in words is "one hundred fifty-one million, two hundred forty thousand, seven hundred eighty-one".