151961 has 4 divisors (see below), whose sum is σ = 158592. Its totient is φ = 145332.

The previous prime is 151939. The next prime is 151967. The reversal of 151961 is 169151.

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 151961 - 2⁶ = 151897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 6607 = 151961 / (1 + 5 + 1 + 9 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151967) 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, 3281 + ... + 3326.

It is an arithmetic number, because the mean of its divisors is an integer number (39648).

2¹⁵¹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

151961 is a deficient number, since it is larger than the sum of its proper divisors (6631).

151961 is an equidigital number, since it uses as much as digits as its factorization.

151961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6630.

The product of its digits is 270, while the sum is 23.

The square root of 151961 is about 389.8217541390. The cubic root of 151961 is about 53.3634682128.

The spelling of 151961 in words is "one hundred fifty-one thousand, nine hundred sixty-one".