151031421 has 12 divisors (see below), whose sum is σ = 218280348. Its totient is φ = 100630464.

The previous prime is 151031407. The next prime is 151031431. The reversal of 151031421 is 124130151.

It can be written as a sum of positive squares in 2 ways, for example, as 27154521 + 123876900 = 5211^2 + 11130^2 .

It is not a de Polignac number, because 151031421 - 2⁵ = 151031389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 151031394 and 151031403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151031431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17401 + ... + 24593.

It is an arithmetic number, because the mean of its divisors is an integer number (18190029).

Almost surely, 2^151031421 is an apocalyptic number.

It is an amenable number.

151031421 is a deficient number, since it is larger than the sum of its proper divisors (67248927).

151031421 is a wasteful number, since it uses less digits than its factorization.

151031421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9532 (or 9529 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 151031421 is about 12289.4841632999. The cubic root of 151031421 is about 532.5443353947.

Adding to 151031421 its reverse (124130151), we get a palindrome (275161572).

The spelling of 151031421 in words is "one hundred fifty-one million, thirty-one thousand, four hundred twenty-one".