151261661 has 4 divisors (see below), whose sum is σ = 155349852. Its totient is φ = 147173472.

The previous prime is 151261613. The next prime is 151261681. The reversal of 151261661 is 166162151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59197636 + 92064025 = 7694^2 + 9595^2 .

It is a cyclic number.

It is not a de Polignac number, because 151261661 - 2²⁶ = 84152797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151261681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2044040 + ... + 2044113.

It is an arithmetic number, because the mean of its divisors is an integer number (38837463).

Almost surely, 2^151261661 is an apocalyptic number.

It is an amenable number.

151261661 is a deficient number, since it is larger than the sum of its proper divisors (4088191).

151261661 is an equidigital number, since it uses as much as digits as its factorization.

151261661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088190.

The product of its digits is 2160, while the sum is 29.

The square root of 151261661 is about 12298.8479541785. The cubic root of 151261661 is about 532.8148105798.

The spelling of 151261661 in words is "one hundred fifty-one million, two hundred sixty-one thousand, six hundred sixty-one".