70121651 has 4 divisors (see below), whose sum is σ = 74246472. Its totient is φ = 65996832.

The previous prime is 70121633. The next prime is 70121671. The reversal of 70121651 is 15612107.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15612107 = 7 ⋅2230301.

It is a cyclic number.

It is not a de Polignac number, because 70121651 - 2²² = 65927347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70121671) 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, 2062385 + ... + 2062418.

It is an arithmetic number, because the mean of its divisors is an integer number (18561618).

Almost surely, 2^70121651 is an apocalyptic number.

70121651 is a deficient number, since it is larger than the sum of its proper divisors (4124821).

70121651 is a wasteful number, since it uses less digits than its factorization.

70121651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124820.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 70121651 is about 8373.8671472624. The cubic root of 70121651 is about 412.3671339456.

Adding to 70121651 its reverse (15612107), we get a palindrome (85733758).

The spelling of 70121651 in words is "seventy million, one hundred twenty-one thousand, six hundred fifty-one".