151455781 has 4 divisors (see below), whose sum is σ = 152612064. Its totient is φ = 150299500.

The previous prime is 151455779. The next prime is 151455793. The reversal of 151455781 is 187554151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 151455781 - 2¹ = 151455779 is a prime.

It is a super-2 number, since 2×151455781² = 45877707196639922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 151455781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151455701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577945 + ... + 578206.

It is an arithmetic number, because the mean of its divisors is an integer number (38153016).

Almost surely, 2^151455781 is an apocalyptic number.

It is an amenable number.

151455781 is a deficient number, since it is larger than the sum of its proper divisors (1156283).

151455781 is a wasteful number, since it uses less digits than its factorization.

151455781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156282.

The product of its digits is 28000, while the sum is 37.

The square root of 151455781 is about 12306.7372199133. The cubic root of 151455781 is about 533.0426405019.

The spelling of 151455781 in words is "one hundred fifty-one million, four hundred fifty-five thousand, seven hundred eighty-one".